自动更新Windows壁纸的Java脚本

准备

jna下载地址https://repo1.maven.org/maven2/net/java/dev/jna/

这里我下载的是jna-5.9.0.jar

注意jna-platform也要下载下载对应版本

jna安装参考

调用api参考

https://www.iteye.com/blog/xpenxpen-2178860

https://www.cnblogs.com/new-life/p/9345840.html

Java: 操作读写注册表(Registry)_RaySunWHUT-CSDN博客_java registry

最终函数写法主要参考https://tieba.baidu.com/p/4743466337

项目创建

一、创建Java项目

二、把jna的包导入库中，jar包添加方法参考https://www.cnblogs.com/yulia/p/6824058.html，具体如下

（1）File——Project Structure

（2）Modules——Dependencies——Add——JARS

OK后可以看到Project窗口有了这个Jar包

// 测试程序
import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Platform;

public class test {
    public interface CLibrary extends Library {
        CLibrary INSTANCE = (CLibrary) Native.loadLibrary((Platform.isWindows() ? "msvcrt" : "c"), CLibrary.class);
        void printf(String format, Object... args);
    }
    public static void main(String[] args) {
        CLibrary.INSTANCE.printf("Hello, World\n");
        for (int i=0;i < args.length;i++) {
            CLibrary.INSTANCE.printf("Argument %d: %s\n", i, args[i]);
        }
    }
}

三、把需要使用的dll文件放入到java工程目录下的bin目录下，比如user32.dll，这个文件默认位置为C:\Windows\System32

查看dll文件中有哪些函数，参考https://blog.csdn.net/zztoll/article/details/105325155

代码编写

注册表换壁纸

一下代码可以成功通过代码更换壁纸，后续再整理思路和改进自动脚本。

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Platform;
import com.sun.jna.platform.win32.Advapi32Util;
import com.sun.jna.platform.win32.WinReg;

public class test {
    public interface CLibrary extends Library{
        CLibrary INSTANCE = (CLibrary) Native.loadLibrary((Platform.isWindows() ?"user32" : "c"), CLibrary.class);
        boolean SystemParametersInfoA(int uiAction, int uiParam, String fnm, int fWinIni);
    }
    public static void reFreshWallPaper(String path) {
        Advapi32Util.registrySetStringValue(WinReg.HKEY_CURRENT_USER,
                "Control Panel\\Desktop", "Wallpaper", path);
        //WallpaperStyle = 10 (Fill), 6 (Fit), 2 (Stretch), 0 (Tile), 0 (Center)
        //For windows XP, change to 0
        Advapi32Util.registrySetStringValue(WinReg.HKEY_CURRENT_USER,
                "Control Panel\\Desktop", "WallpaperStyle", "10"); //fill
        Advapi32Util.registrySetStringValue(WinReg.HKEY_CURRENT_USER,
                "Control Panel\\Desktop", "TileWallpaper", "0");   // no tiling

        // 刷新
        // refresh the desktop using User32.SystemParametersInfo(), so avoiding an OS reboot
        int SPI_SETDESKWALLPAPER = 0x14;
        int SPIF_UPDATEINIFILE = 0x01;
        int SPIF_SENDWININICHANGE = 0x02;

        boolean result = CLibrary.INSTANCE.SystemParametersInfoA(SPI_SETDESKWALLPAPER, 0,
                path, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE );
    }

    public static void main(String[] args) {
        reFreshWallPaper("C:\\Users\\victor\\Downloads\\IMG_20211128_164530.jpg");
    }
}

从指定目录中读取图片文件名列表

Java 获取指定目录下指定后缀名的文件名称_清平调、其N 的博客-CSDN博客_java获取指定后缀的文件

public static ArrayList<String> getFileName(String path) {
    File desktop = new File(path);
    String[] arr = desktop.list();
    assert arr != null;
    ArrayList<String> jpgFileName = new ArrayList<>();
    for (String s : arr) {
        if(s.endsWith(".png") || s.endsWith(".jpg") ) {
            jpgFileName.add(s);
        }
    }
    return jpgFileName;
}

定时更新，目前暂时实现指定秒钟读数后换壁纸

另外，只顺序遍历目录中图片文件一次

import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.Platform;
import com.sun.jna.platform.win32.Advapi32Util;
import com.sun.jna.platform.win32.WinReg;

import java.io.File;
import java.util.ArrayList;
import java.util.concurrent.TimeUnit;

public class test {
    public interface CLibrary extends Library{
        CLibrary INSTANCE = (CLibrary) Native.loadLibrary((Platform.isWindows() ?"user32" : "c"), CLibrary.class);
        boolean SystemParametersInfoA(int uiAction, int uiParam, String fnm, int fWinIni);
    }
    public static void reFreshWallPaper(String path) {
        Advapi32Util.registrySetStringValue(WinReg.HKEY_CURRENT_USER,
                "Control Panel\\Desktop", "Wallpaper", path);
        //WallpaperStyle = 10 (Fill), 6 (Fit), 2 (Stretch), 0 (Tile), 0 (Center)
        //For windows XP, change to 0
        Advapi32Util.registrySetStringValue(WinReg.HKEY_CURRENT_USER,
                "Control Panel\\Desktop", "WallpaperStyle", "10"); //fill
        Advapi32Util.registrySetStringValue(WinReg.HKEY_CURRENT_USER,
                "Control Panel\\Desktop", "TileWallpaper", "0");   // no tiling

        // 刷新
        // refresh the desktop using User32.SystemParametersInfo(), so avoiding an OS reboot
        int SPI_SETDESKWALLPAPER = 0x14;
        int SPIF_UPDATEINIFILE = 0x01;
        int SPIF_SENDWININICHANGE = 0x02;

        boolean result = CLibrary.INSTANCE.SystemParametersInfoA(SPI_SETDESKWALLPAPER, 0,
                path, SPIF_UPDATEINIFILE | SPIF_SENDWININICHANGE );
    }

    public static ArrayList<String> getFileName(String path) {
        File desktop = new File(path);
        String[] arr = desktop.list();
        assert arr != null;
        ArrayList<String> jpgFileName = new ArrayList<>();
        for (String s : arr) {
            if(s.endsWith(".png") || s.endsWith(".jpg") ) {
                jpgFileName.add(s);
            }
        }
        return jpgFileName;
    }

    public static void main(String[] args) throws InterruptedException {
        ArrayList<String> name = getFileName("C:\\Users\\victor\\Downloads");
        for (String s:name) {
            reFreshWallPaper("C:\\Users\\victor\\Downloads\\" + s);
            TimeUnit.SECONDS.sleep(3);
        }
    }
}